U.S. patent application number 16/619092 was filed with the patent office on 2021-10-28 for backlight structure and display panel.
This patent application is currently assigned to Huizhou China Star Optoelectronics Technology Co., Ltd.. The applicant listed for this patent is HUIZHOU CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.. Invention is credited to Yongyuan QIU.
Application Number | 20210333639 16/619092 |
Document ID | / |
Family ID | 1000005749150 |
Filed Date | 2021-10-28 |
United States Patent
Application |
20210333639 |
Kind Code |
A1 |
QIU; Yongyuan |
October 28, 2021 |
BACKLIGHT STRUCTURE AND DISPLAY PANEL
Abstract
A backlight structure and a display panel. The backlight
structure includes a backlight source and a microlens array. The
microlens array includes a support plate including a first surface
and a second surface, the first surface having a plurality of light
incident structures, and the second surface has a plurality of
light emitting structures corresponding to the plurality of light
incident structures, the plurality of light incident structures are
press-formed on the first surface by a first mold, and the
plurality of light emitting structures are press-formed on the
second surface by a second mold.
Inventors: |
QIU; Yongyuan; (Huizhou,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HUIZHOU CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD. |
Huizhou, Guangdong |
|
CN |
|
|
Assignee: |
Huizhou China Star Optoelectronics
Technology Co., Ltd.
Huizhou, Guangdong
CN
|
Family ID: |
1000005749150 |
Appl. No.: |
16/619092 |
Filed: |
July 12, 2019 |
PCT Filed: |
July 12, 2019 |
PCT NO: |
PCT/CN2019/095874 |
371 Date: |
December 4, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02F 1/133607 20210101;
G02F 1/133603 20130101; G02F 1/133605 20130101; H01L 25/0753
20130101 |
International
Class: |
G02F 1/1335 20060101
G02F001/1335; H01L 25/075 20060101 H01L025/075; G02F 1/13357
20060101 G02F001/13357 |
Foreign Application Data
Date |
Code |
Application Number |
May 28, 2019 |
CN |
201910450654.7 |
Claims
1. A backlight structure, wherein the backlight structure
comprises: a backlight source; a microlens array disposed on the
backlight source; wherein the microlens array comprises a support
plate, the support plate comprises a first surface adjacent to the
backlight source and a second surface away from the backlight
source, the first surface has a plurality of light incident
structures, and the second surface has a plurality of light
emitting structures corresponding to the plurality of light
incident structures, the light incident structures and the light
emitting structures corresponding to the light incident structures
constitute a plurality of microlens structures; wherein the
microlens structures are arranged in a strip-shape along a first
direction.
2. The backlight structure according to claim 1, wherein the
backlight source comprises a plurality of micro light emitting
diodes disposed on a light board, the micro light emitting diodes
are in one-to-one correspondence with the plurality of microlens
structures.
3. The backlight structure according to claim 2, wherein each of
the light incident structures comprises a first protrusion
structure; wherein the first protrusion structure has a first
surface in contact with a surface of the light board; the first
protrusion structure further comprises a first recessed portion
disposed at a geometric center of the first surface, the first
recessed portion corresponding to the micro light emitting diode,
and a surface of the first recessed portion constitutes a light
incident surface of the microlens structure.
4. The backlight structure according to claim 3, wherein the first
recess is a hemispherical structure, and the micro light emitting
diode corresponding to the light incident structure is disposed at
a center of the hemispherical structure.
5. The backlight structure according to claim 3, wherein each of
the light emitting structures comprises a second protrusion
structure; wherein the second protruding structure has a second
recessed portion disposed at a geometric center of the second
protrusion structure, a geometric center of the second protrusion
structure overlaps with a geometric center of the first protrusion
structure; wherein the second protrusion structure further
comprises a second annular portion surrounding the second recessed
portion, a surface of the second annular portion is a smooth curved
surface connecting a boundary of the second recess and a surface of
the support plate.
6. The backlight structure according to claim 5, wherein a material
forming the support plate, the first protrusion structure, and the
second protrusion structure is a transparent material, and the
transparent material has thermoplastic material.
7. The backlight structure according to claim 6, wherein a surface
of the second recessed portion is a mirror structure consisted of a
reflective material, the surface of the second recessed portion
constitutes a reflective surface of the microlens structure, a
surface of the second annular portion constitutes a light emitting
surface of the microlens structure.
8. The backlight structure according to claim 5, wherein geometric
centers of the first recessed portion and the second recessed
portion overlap, a projection of the first recessed portion on the
support plate and a projection of the second recessed portion on
the support plate are circular, the projection of the first
recessed portion on the support plate covers the projection of the
second recessed portion on the support plate.
9. The backlight structure according to claim 1, wherein the
microlens array further comprises a plurality of support columns
disposed on the second surface of the support plate, and each
support column is located between two adjacent microlens
structures.
10. The backlight structure of claim 9, wherein the plurality of
support columns have a same height, and surfaces of the support
columns have a diffuse reflection structure.
11. A backlight structure, wherein the backlight structure
comprises: a backlight source; a microlens array disposed on the
backlight source; wherein the microlens array comprises a support
plate, the support plate comprises a first surface adjacent to the
backlight source and a second surface away from the backlight
source, the first surface has a plurality of light incident
structures, and the second surface has a plurality of light
emitting structures corresponding to the plurality of light
incident structures, the light incident structures and the light
emitting structures corresponding to the light incident structures
constitute a plurality of microlens structures.
12. The backlight structure according to claim 11, wherein the
backlight source comprises a plurality of micro light emitting
diodes disposed on a light board, the micro light emitting diodes
are in one-to-one correspondence with the plurality of microlens
structures.
13. The backlight structure according to claim 12, wherein each of
the light incident structures comprises a first protrusion
structure; wherein the first protrusion structure has a first
surface in contact with a surface of the light board; the first
protrusion structure further comprises a first recessed portion
disposed at a geometric center of the first surface, the first
recessed portion corresponding to the micro light emitting diode,
and a surface of the first recessed portion constitutes a light
incident surface of the microlens structure.
14. The backlight structure according to claim 13, wherein the
first recess is a hemispherical structure, and the micro light
emitting diode corresponding to the light incident structure is
disposed at a center of the hemispherical structure.
15. The backlight structure according to claim 13, wherein each of
the light emitting structures comprises a second protrusion
structure; wherein the second protruding structure has a second
recessed portion disposed at a geometric center of the second
protrusion structure, a geometric center of the second protrusion
structure overlaps with a geometric center of the first protrusion
structure; wherein the second protrusion structure further
comprises a second annular portion surrounding the second recessed
portion, a surface of the second annular portion is a smooth curved
surface connecting a boundary of the second recess and a surface of
the support plate.
16. The backlight structure according to claim 15, wherein a
material forming the support plate, the first protrusion structure,
and the second protrusion structure is a transparent material, and
the transparent material has thermoplastic material.
17. The backlight structure according to claim 16, wherein a
surface of the second recessed portion is a mirror structure
consisted of a reflective material, the surface of the second
recessed portion constitutes a reflective surface of the microlens
structure, a surface of the second annular portion constitutes a
light emitting surface of the microlens structure.
18. The backlight structure according to claim 15, wherein
geometric centers of the first recessed portion and the second
recessed portion overlap, a projection of the first recessed
portion on the support plate and a projection of the second
recessed portion on the support plate are circular, the projection
of the first recessed portion on the support plate covers the
projection of the second recessed portion on the support plate.
19. The backlight structure according to claim 11, wherein the
microlens array further comprises a plurality of support columns
disposed on the second surface of the support plate, and each
support column is located between two adjacent microlens
structures.
20. A display panel comprising a backlight structure, wherein the
backlight structure comprises: a backlight source; a microlens
array disposed on the backlight source; wherein the microlens array
comprises a support plate, the support plate comprises a first
surface adjacent to the backlight source and a second surface away
from the backlight source, the first surface has a plurality of
light incident structures, and the second surface has a plurality
of light emitting structures corresponding to the plurality of
light incident structures, the light incident structures and the
light emitting structures corresponding to the light incident
structures constitute a plurality of microlens structures; wherein
the light incident structures are press-formed on the first surface
by a first mold, the light emitting structures are press-formed on
the second surface by a second mold.
Description
BACKGROUND OF INVENTION
Field of Invention
[0001] The present invention relates to the field of display
technologies, and in particular, to a backlight structure and a
display panel.
Description of Prior Art
[0002] Sub-millimeter light-emitting diodes (mini-LED) greatly
reduce the size of a backlight source in a liquid crystal panel so
that the size of backlight units can be less than 100 micrometers
and the backlight sources can be thinned, miniaturized, and
arrayed. Each pixel of a liquid crystal panel using the mini-LEDs
can be addressed and driven individually.
Technical Problem
[0003] Because the current microlens structure is too large to be
used in the mini-LED backlight structure and microlens arrays
realized by injection molding generally have a small area, there is
an urgent need for a microlens structure suitable for mini-LEDs to
further improve the light diffusion effect of the mini-LEDs and
reduce the number of mini-LEDs to reduce the cost.
SUMMARY OF INVENTION
[0004] The present application provides a backlight structure and a
display panel, the backlight structure is provided with a microlens
structure suitable for Mini-LEDs.
[0005] To solve the above problems, the present application
provides a backlight structure, wherein the backlight structure
comprises:
[0006] a backlight source;
[0007] a microlens array disposed on the backlight source;
[0008] wherein the microlens array comprises a support plate, the
support plate comprises a first surface adjacent to the backlight
source and a second surface away from the backlight source, the
first surface has a plurality of light incident structures, and the
second surface has a plurality of light emitting structures
corresponding to the plurality of light incident structures, the
light incident structures and the light emitting structures
corresponding to the light incident structures constitute a
plurality of microlens structures;
[0009] wherein the light incident structures are press-formed on
the first surface by a first mold, the light emitting structures
are press-formed on the second surface by a second mold;
[0010] wherein the microlens structures are arranged in a
strip-shape along a first direction.
[0011] According to one aspect of the application, wherein the
backlight source comprises a plurality of micro light emitting
diodes disposed on a light board, the micro light emitting diodes
are in one-to-one correspondence with the plurality of microlens
structures.
[0012] According to one aspect of the application, wherein each of
the light incident structures comprises a first protrusion
structure;
[0013] wherein the first protrusion structure has a first surface
in contact with a surface of the light board;
[0014] the first protrusion structure further comprises a first
recessed portion disposed at a geometric center of the first
surface, the first recessed portion corresponding to the micro
light emitting diode, and a surface of the first recessed portion
constitutes a light incident surface of the microlens
structure.
[0015] According to one aspect of the application, wherein the
first recess is a hemispherical structure, and the micro light
emitting diode corresponding to the light incident structure is
disposed at a center of the hemispherical structure.
[0016] The backlight structure according to claim 3, wherein each
of the light emitting structures comprises a second protrusion
structure;
[0017] wherein the second protruding structure has a second
recessed portion disposed at a geometric center of the second
protrusion structure, a geometric center of the second protrusion
structure overlaps with a geometric center of the first protrusion
structure;
[0018] wherein the second protrusion structure further comprises a
second annular portion surrounding the second recessed portion, a
surface of the second annular portion is a smooth curved surface
connecting a boundary of the second recess and a surface of the
support plate.
[0019] According to one aspect of the application, wherein a
material forming the support plate, the first protrusion structure,
and the second protrusion structure is a transparent material, and
the transparent material has thermoplastic material.
[0020] According to one aspect of the application, wherein a
surface of the second recessed portion is a mirror structure
consisted of a reflective material, the surface of the second
recessed portion constitutes a reflective surface of the microlens
structure, a surface of the second annular portion constitutes a
light emitting surface of the microlens structure.
[0021] According to one aspect of the application, wherein
geometric centers of the first recessed portion and the second
recessed portion overlap, a projection of the first recessed
portion on the support plate and a projection of the second
recessed portion on the support plate are circular, the projection
of the first recessed portion on the support plate covers the
projection of the second recessed portion on the support plate.
[0022] According to one aspect of the application, wherein the
microlens array further comprises a plurality of support columns
disposed on the second surface of the support plate, and each
support column is located between two adjacent microlens
structures.
[0023] According to one aspect of the application, wherein the
plurality of support columns have a same height, and surfaces of
the support columns have a diffuse reflection structure.
[0024] The present application further provides a backlight
structure, wherein the backlight structure comprises:
[0025] a backlight source;
[0026] a microlens array disposed on the backlight source;
[0027] wherein the microlens array comprises a support plate, the
support plate comprises a first surface adjacent to the backlight
source and a second surface away from the backlight source, the
first surface has a plurality of light incident structures, and the
second surface has a plurality of light emitting structures
corresponding to the plurality of light incident structures, the
light incident structures and the light emitting structures
corresponding to the light incident structures constitute a
plurality of microlens structures;
[0028] wherein the light incident structures are press-formed on
the first surface by a first mold, the light emitting structures
are press-formed on the second surface by a second mold.
[0029] According to one aspect of the application, wherein the
backlight source comprises a plurality of micro light emitting
diodes disposed on a light board, the micro light emitting diodes
are in one-to-one correspondence with the plurality of microlens
structures.
[0030] According to one aspect of the application, wherein each of
the light incident structures comprises a first protrusion
structure;
[0031] wherein the first protrusion structure has a first surface
in contact with a surface of the light board;
[0032] the first protrusion structure further comprises a first
recessed portion disposed at a geometric center of the first
surface, the first recessed portion corresponding to the micro
light emitting diode, and a surface of the first recessed portion
constitutes a light incident surface of the microlens
structure.
[0033] According to one aspect of the application, wherein the
first recess is a hemispherical structure, and the micro light
emitting diode corresponding to the light incident structure is
disposed at a center of the hemispherical structure.
[0034] According to one aspect of the application, wherein each of
the light emitting structures comprises a second protrusion
structure;
[0035] wherein the second protruding structure has a second
recessed portion disposed at a geometric center of the second
protrusion structure, a geometric center of the second protrusion
structure overlaps with a geometric center of the first protrusion
structure;
[0036] wherein the second protrusion structure further comprises a
second annular portion surrounding the second recessed portion, a
surface of the second annular portion is a smooth curved surface
connecting a boundary of the second recess and a surface of the
support plate.
[0037] The backlight structure according to claim 15, wherein a
material forming the support plate, the first protrusion structure,
and the second protrusion structure is a transparent material, and
the transparent material has thermoplastic material.
[0038] According to one aspect of the application, wherein a
surface of the second recessed portion is a mirror structure
consisted of a reflective material, the surface of the second
recessed portion constitutes a reflective surface of the microlens
structure, a surface of the second annular portion constitutes a
light emitting surface of the microlens structure.
[0039] According to one aspect of the application, wherein
geometric centers of the first recessed portion and the second
recessed portion overlap, a projection of the first recessed
portion on the support plate and a projection of the second
recessed portion on the support plate are circular, the projection
of the first recessed portion on the support plate covers the
projection of the second recessed portion on the support plate.
[0040] According to one aspect of the application, wherein the
microlens array further comprises a plurality of support columns
disposed on the second surface of the support plate, and each
support column is located between two adjacent microlens
structures.
[0041] The present application further provides a display panel
comprising a backlight structure, wherein the backlight structure
comprises:
[0042] a backlight source;
[0043] a microlens array disposed on the backlight source;
[0044] wherein the microlens array comprises a support plate, the
support plate comprises a first surface adjacent to the backlight
source and a second surface away from the backlight source, the
first surface has a plurality of light incident structures, and the
second surface has a plurality of light emitting structures
corresponding to the plurality of light incident structures, the
light incident structures and the light emitting structures
corresponding to the light incident structures constitute a
plurality of microlens structures;
[0045] wherein the light incident structures are press-formed on
the first surface by a first mold, the light emitting structures
are press-formed on the second surface by a second mold.
Beneficial Effects
[0046] The application provides a backlight structure having a
support plate, a first surface of the support plate has a plurality
of light incident structures, a second surface of the support plate
has a plurality of light emitting structures corresponding to the
plurality of light incident structures. The plurality of light
incident structures and the plurality of light emitting structures
form a plurality of microlens structures. In the present
application, the plurality of light incident structures and the
plurality of light emitting structures are formed by different
molds. The microlens array provided by the present application is
press-formed and can form a large-area microlens array suitable for
mini-LEDs, thereby solving the technical problem that the microlens
array in the prior art cannot be applied to the mini-LEDs.
BRIEF DESCRIPTION OF DRAWINGS
[0047] FIG. 1 is a structural diagram of a microlens array in a
specific embodiment of the present application.
[0048] FIG. 2 is a structural diagram of a microlens in the
microlens array of FIG. 1.
[0049] FIG. 3 is a structural diagram of a backlight structure in a
specific embodiment of the present application.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0050] Description of following embodiment, with reference to
accompanying drawings, is used to exemplify specific embodiments
which may be carried out in the present disclosure. Directional
terms mentioned in the present disclosure, such as "top", "bottom",
"front", "back", "left", "right", "inside", "outside", "side",
etc., are only used with reference to orientation of the
accompanying drawings. Therefore, the directional terms are
intended to illustrate, but not to limit, the present disclosure.
In the drawings, components having similar structures are denoted
by same numerals.
[0051] The present application provides a backlight structure and a
display panel, the backlight structure is provided with a microlens
structure suitable for mini-LEDs. Referring to FIG. 1, FIG. 2 and
FIG. 3, FIG. 1 is a structural diagram of a microlens array in a
specific embodiment of the present application, FIG. 2 is a
structural diagram of a microlens in the microlens array of FIG. 1,
FIG. 3 is a structural diagram of a backlight structure in a
specific embodiment of the present application.
[0052] As shown in FIG. 3, the backlight structure includes a
backlight source and a microlens array disposed on the backlight
source. The microlens array includes a support plate 100, the
support plate 100 includes a first surface adjacent to the
backlight source and a second surface away from the backlight
source, the first surface has a plurality of light incident
structures 220, and the second surface has a plurality of light
emitting structures 210 corresponding to the plurality of light
incident structures 220, the light incident structures 220 and the
light emitting structures 210 corresponding to the light incident
structures 220 constitute a plurality of microlens structures.
[0053] In the present embodiment, the light incident structures 220
are press-formed on the first surface by a first mold, the light
emitting structures 210 are press-formed on the second surface by a
second mold.
[0054] The backlight source comprises a plurality of micro light
emitting diodes 400 disposed on a light board 500. Preferably, the
backlight source comprises a plurality of light panels 500, the
light boards 500 are strip light boards and the plurality of micro
light emitting diodes 400 are arranged in a strip shape in a first
direction. The plurality of light panels 500 are arranged in a
second direction perpendicular to the first direction. The micro
light emitting diodes 400 are in one-to-one correspondence with the
plurality of microlens structures.
[0055] Referring to FIG. 2, in the present application, each of the
light incident structures 220 comprises a first protrusion
structure. The first protrusion structure has a first surface 222
in contact with a surface of the light board 500. The first
protrusion structure further comprises a first recessed portion 221
disposed at a geometric center of the first surface, the first
recessed portion 221 corresponding to the micro light emitting
diode, and a surface of the first recessed portion 221 constitutes
a light incident surface of the microlens structure.
[0056] In the present application, the first recess 221 is a
hemispherical structure, and the micro light emitting diode
corresponding to the light incident structure 220 is disposed at a
center of the hemispherical structure.
[0057] In the present application, each of the light emitting
structures 220 includes a second protrusion structure. The second
protruding structure has a second recessed portion 211 disposed at
a geometric center of the second protrusion structure, a geometric
center A of the second protrusion structure overlaps with a
geometric center of the first protrusion structure.
[0058] In the present embodiment, the second protrusion structure
further comprises a second annular portion 212 surrounding the
second recessed portion, a surface of the second annular portion
212 is a smooth curved surface connecting a boundary of the second
recess 211 and a surface of the support plate 100.
[0059] In the present application, a material forming the support
plate 100, the first protrusion structure, and the second
protrusion structure is a transparent material, and the transparent
material has thermoplastic material.
[0060] Because the size of the micro light-emitting diodes is
small, the method in the prior art of producing a lens array cannot
produce millimeter-scale microlenses. In the present application, a
transparent material having thermoplasticity is used and a
microlens array is formed by imprinting a surface of the
transparent material through a mold. This method enables a
formation of microlens arrays with various shapes and sizes to meet
the requirements of micro light-emitting diodes. At the same time,
the method is simple in process, low in cost, convenient for mass
production, and can greatly improve the light mixing effect of the
backlight structure using micro light-emitting diodes.
[0061] In the present application, a surface of the second recessed
portion 211 is a mirror structure consisted of a reflective
material, the surface of the second recessed portion constitutes a
reflective surface of the microlens structure, a surface of the
second annular portion 212 constitutes a light emitting surface of
the microlens structure. Geometric centers of the first recessed
portion 221 and the second recessed portion 211 overlap, a
projection of the first recessed portion 221 on the support plate
and a projection of the second recessed portion 211 on the support
plate are circular, the projection of the first recessed portion
221 on the support plate covers the projection of the second
recessed portion 211 on the support plate.
[0062] In the present embodiment, the microlens array further
includes a plurality of support columns 300 disposed on the second
surface of the support plate 100, and each support column 300 is
located between two adjacent microlens structures.
[0063] In this embodiment, the support columns 300 have a same
height. On one hand, it is used to disperse pressure applied to the
microlens array by other optical films, and the microlens array can
be protected of being cracked due to uneven force. On the other
hand, it is also possible to ensure that the distance between the
microlens array and other optical films remains constant.
Preferably, in order to prevent the support columns 300 from
forming spots or shadows on the display panel, the materials
forming the plurality of support pillars 300 are white materials or
transparent materials, and the surfaces of the plurality of support
pillars 300 have a diffuse reflection structure.
[0064] Further, the present application provides a display panel
including the backlight structure described above.
[0065] The application provides a backlight structure having a
support plate, a first surface of the support plate has a plurality
of light incident structures, a second surface of the support plate
has a plurality of light emitting structures corresponding to the
plurality of light incident structures. The plurality of light
incident structures and the plurality of light emitting structures
form a plurality of microlens structures. In the present
application, the plurality of light incident structures and the
plurality of light emitting structures are formed by different
molds. The microlens array provided by the present application is
press-formed and can form a large-area microlens array suitable for
mini-LEDs, thereby solving the technical problem that the microlens
array in the prior art cannot be applied to the mini-LEDs.
[0066] As is understood by persons skilled in the art, the
foregoing preferred embodiments of the present disclosure are
illustrative rather than limiting of the present disclosure. It is
intended that they cover various modifications and that similar
arrangements be included in the spirit and scope of the present
disclosure, the scope of which should be accorded the broadest
interpretation so as to encompass all such modifications and
similar structures.
* * * * *